Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Analysis of complex waves
Patent
1982-10-18
1985-03-05
Levy, Stewart J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Analysis of complex waves
G01R 2316
Patent
active
045033820
ABSTRACT:
A device for detecting the centroid of a beam of electromagnetic energy is shown including means for focusing the beam into a blur spot upon a focal plane. Photodetectors located at the focal plane detect the centroid of the blur spot on either side of its nominal location. The intensity of the output from each photodetector is then measured and the difference and sum of these measurements obtained. By dividing the difference by the sum of the resultant signals, it is possible to produce an analog signal which represents the location of the blur spot centroid regardless of its amplitude. This arrangement has particular application in acousto-optic devices for measuring the frequency and direction of arrival of an incoming radio frequency wave.
REFERENCES:
patent: 3532892 (1970-10-01), Murphy
patent: 3551680 (1970-12-01), Knight
patent: 3557372 (1971-01-01), Ede
patent: 3954340 (1976-05-01), Blomqvist
patent: 4198634 (1980-04-01), Jernigan
GTE Sylvania, "Acousto-Optic Processor Feasibility Model for Simultaneous Spatial and Spectral Analysis," Jun. 30, 1978, pp. 1-6, 2-12 to 2-14 and others.
David, Jr. Edward H.
Price Michael G.
Zehl Otis G.
Levy Stewart J.
Litton Systems Inc.
Rotella Robert F.
Wallach Michael H.
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